java-programmer >>Certification is a must in MNCs,the comming Future.

Certification is a must in MNCs,the comming Future.

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- 1
  - static funtionsHello
    
    i have some simple question reguarding static functions:
    If i have some class that implements a static function that is called
    from many places inside the app would every call have to wait for
    termination of a previous call to that static function?
    The function is not defined as synchronized.
    
    If not, how is this realized in java? I mean if i understood it right
    static functions are functions of the class not of any object so this
    function should not be present more than once in memory right? Would i
    overwrite the functionstate if i'd call the function eg. from more
    threads?
    
    _thanks for your info in advance
    
    PS: the function does some DB calls in a tomcat app where some thousend
    people call the function within short time and i'd like to avoid the
    waiting, so i thought of changing the function to be nonstatic but
    first i'd like to understand how static functions work :)
- 6
  - Error Installing Jboss ServerHi,
    
    I am trying to install Jboss application server on linux. When I ran sh
    run.sh from Jboss Bin Directory, It gave me the following
    messages/Errors.
    
    JBoss Bootstrap Environment
    
    JBOSS_HOME: /home/cabig/jboss-4.0.2
    
    JAVA: /usr/java/j2sdk1.4.2_11/bin/java
    
    JAVA_OPTS: -server -Xms128m -Xmx128m -Dprogram.name=run.sh
    
    CLASSPATH:
    /home/cabig/jboss-4.0.2/bin/run.jar:/usr/java/j2sdk1.4.2_11/lib/tools.jar
    
    =========================================================================
    
    Failed to boot JBoss:
    java.lang.ClassNotFoundException: org.jboss.system.server.ServerImpl
    at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
    at
    org.jboss.system.server.ServerLoader.createServer(ServerLoader.java:271)
    at
    org.jboss.system.server.ServerLoader.load(ServerLoader.java:253)
    at org.jboss.Main.boot(Main.java:187)
    at org.jboss.Main$1.run(Main.java:463)
    at java.lang.Thread.run(Thread.java:534)
    
    Kindly let me know what the error is ? How to solve this ?
    
    Appreciate your Help,
    
    Thanks
    shan
- 6
  - how to add double key listenerhi,
    i want to catch the key event when SHIFT+TAB are pressed simultaneously
    to shift focus to the previous focusable component. the key event is
    caught on a JComboBox. if somebody knows the code to do so plz post it.
    thanx in advance.
- 6
  - JPogressBar does not update UIHi,
    
    i would like to show a JProgessBar during a longer process. I can show
    it, but I cannot get the JProgressBar to update the UI, so it just
    appears and at the end it disappears again, but it's not changed in the
    meantime.
    
    Example code, JProgressBar in JDialog, Java 1.4.2:
    
    public class DialogProgressBar extends JDialog {
    
    private JProgressBar jpb;
    
    public DialogProgressBar(String title, java.awt.Frame owner, boolean
    modal) {
    super(owner, title, modal);
    
    jpb = new JProgressBar();
    jpb.setStringPainted(true);
    this.getContentPane().add(jpb, java.awt.BorderLayout.CENTER);
    setSize(300,50);
    }
    
    public JProgressBar getProgressBar() {
    return jpb;
    }
    
    }
    
    and that's how I use the Dialog/JProgressBar.
    ...
    DialogProgressBar pb = new DialogProgressBar("Titel", dialog, false);
    
    ...
    public void actionPerformed(ActionEvent aE) {
    
    ...
    else if(cmd.equals("mniSynchronize")) {
    int selectedRows = 3;
    
    pb.getProgressBar().setMinimum(0);
    pb.getProgressBar().setValue(0);
    pb.getProgressBar().setMaximum(selectedRows);
    pb.setVisible(true);
    
    for(int i=0;i<selectedRows;i++) {
    
    switch(i) {
    case 1: pb.getProgressBar().setString("file001");
    storeFiletype001();
    break;
    
    case 2: pb.getProgressBar().setString("file002");
    storeFiletype002();
    break;
    
    case 3: pb.getProgressBar().setString("file003");
    storeFiletype003();
    break;
    }
    
    pb.getProgressBar().setValue(i+1);
    }
    pb.setVisible(false);
    }
    }
    
    Thanks,
    Aloys
- 6
  - Class, Class, where is the ClassIs there a reference somewhere which lists which classes are in which
    .jar files?
    
    For instance, if I want to use HTTPServlet, which jar file is it in (I
    know where it is, just an example...)?
    
    All the API docs give the package name, but where is the package?
    
    TKS!!
- 6
  - Math.IEEEremainder vs. %Today I encountered some code using Math.IEEEremainder to calculate the
    remainder of two ints, for a simple pagination calculation. I normally
    would just use %, but I'm wondering if anyone knows of a specific
    reason to use Math.IEEEremainder for this type of calculation instead.
- 7
  - Taglib to build smart html tablesHello,
    
    I need to build smart html tables (with sortable columns, merged cells,
    pictures, different colors and fonts, etc -- all the kind of stuff html &
    javascript allow).
    
    I recall I've seen here a post a while ago of such an impressive component,
    but I can't find it. :-(
    
    Do you know such components ?
    
    Thanks.
- 9
  - Finding memory leak in big appI have an application that uses a lot of memory (up to a gig) and I'm
    trying to track a memory leak. The problem is that all of the tools I've
    found can't handle such large heap sizes. They generally just run out of
    memory themselves.
    
    The bulk of the memory is taken up by double[] and char[], but I need to
    know who owns these arrays so I can see why there are so many of them. Is
    there any tool that will let me track object ownership, or just give me a
    useful heap dump that I can parse myself?
    
    I'm running this on red hat advanced server 4 proc/8gig ram.
    
    I can work with any jdk that's version 1.4.0_01 or higher.
    
    Thanks
- 10
  - To getenv or not getenvI'm using 1.4.2 for some commecial development. I was just about to set
    a property and pass it on the command line when I noticed that System.getenv is
    not deprecated in 1.5.0. So is it bad form to use a deprecated 'getenv'
    in 1.4.2 given its new lease of life in 1.5.0??
    
    Being 'allowed' to use getenv would make certain parts of the program
    more expressive.
    
    Cheers,
    Lordy
- 10
  - recieve emailHi all,
    I have googled around to look for recieving posts in this group by
    email but not succeeded. Anyone know how to do it ?
    
    thanks
- 11
  - [junit] Disabling OutputHi,
    
    I have several test cases where I want the output to be displayed when I run
    the TestRunner class as a stand-alone app. But, I also want to run a test
    suite within an application of mine, but have the System output disabled...
    is there a way in the JUnit API to disable the text that is displayed?
    
    Thanks
- 12
  - Gomez, Inc - Lexington, MA - JAVA DEVELOPER Needed**TO APPLY**
    Please e-mail a formal resume to email***@***.com and include salary
    requirements. Local candidates only please. No agencies at this
    time.
    
    Title: Senior Software Engineer
    Skills: Java Swing API HTTP UI
    
    Location: Lexington, MA
    
    Job description:
    Gomez, Inc., the leading provider of Web Application Experience
    Management solutions, is seeking a Senior Software Engineer to develop
    and maintain a critical component of Gomez's performance monitoring
    technology.
    
    Job Description:
    
    In this role, you will own development and maintenance of the Gomez
    Script Recorder, a core component of our website performance
    monitoring service. You will be required to work closely with other
    developers and members of the product management team to implement
    requirements and support the product. Success in this role requires
    strong attention to detail, a flair for developing solid user
    interfaces, and superb communication skills both internally and
    externally to the company.
    
    The ideal candidate should have a strong background in the required
    technology, experience solving complicated problems on predictable
    timelines, and a commitment to maintaining high quality code through
    best practices.
    
    Job Responsibilities:
    
    * Serve as primary developer for the application, working closely with
    engineering and product management to refine and implement product
    requirements
    * Assist QA by helping define test plans, building unit tests, etc.
    * Maintain compatibility with the latest version of Gomez's monitoring
    agent
    * Participate in customer support issues, engaging customers directly
    if needed
    
    Job Requirements:
    
    * Academic background in computer science or equivalent
    * Several years of Java language experience
    * Java Swing API experience, the stronger the better
    * Deep knowledge of core web technologies, particularly HTTP and
    Javascript
    * Windows platform experience desired, particularly COM
    * User Interface design experience a plus
    * Excellent communication skills; flexibility and a strong attention
    to detail a must
    * Ability to work independently and as a team member
    
    Travel required: none
    Telecommute: no
- 13
  - Tips for backporting Java 1.6 classes into Java 1.5? I'm writing a Swing app, and I wanted a way to filter certain rows out
    of a JTable. I search Sun's API to see if they had any facilities for doing
    this, and I while I couldn't find such an API for 1.5, there is one for 1.6:
    javax.swing.RowFilter
    (http://download.java.net/jdk6/docs/api/javax/swing/RowFilter.html)
    
    So I have a bit of a dilemma here. I don't want to have to "wait" for
    1.6 to come out. I don't want to actually use a beta version of 1.6 (forcing
    my clients to do the same). But I don't want to implement this functionality
    myself, only to have to re-architecture my app when 1.6 does come out and we
    want to switch to the official API.
    
    The solution I've come up with is to write a class which implements the
    same interface as Sun's javax.swing.RowFilter class, with the hope that the
    interface won't change significantly when 1.6 is finally released. Then,
    hopefully, when 1.6 does come out, the changes require to switch from my
    implementation to Sun's implementation should be relatively minor (the
    method signatures will be the same, and hopefully my interpretation of the
    semantics will be close enough to the actual semantics that no bugs will
    surface).
    
    Is this the right approach, or is there a better way?
    
    - Oliver
- 14
  - A better looking JTableI want to create a JTable that emulates the appearance of native tables
    on Windows and OSX. In particular, if the panel that a table is in is
    taller than the size of the table (due to the table only having a few
    rows), I want the extra space in the table to be filled with empty
    cells, so that the table fills the whole panel.
    
    This behaviour is present in most native apps I've seen that use tables.
    A good example is the iTunes songs list.
    
    My specific scenario is that I have a table which may contain only 1
    row, or may contain as many as 50 (typically it contains 2 or 3 rows).x
    
    I want to display this table in a pane that is resizable.
    
    This means that the table may have a lot of extra veritcal space,
    relative to the rows being displayed. I want it to fill the unused,
    lower part of the pane with empty cells as the pane is made larger (and
    when it is first drawn).
    
    Is there a simple way to do this, or do I need to create a custom JTable
    class to paint the table as described?
    
    Any suggestions will be much appreciated.
    
    Rob
- 15
  - Write object array to CSVI'm trying to write an object array to a CSV file. I can't seem to get
    to the actual instances, rather than the reference. I can use
    ObjectOutputStream and writeObject to handle writing to a bin file, but
    am stuck on CSV.
    
    fos = new FileOutputStream("asg3out.bin");
    ObjectOutputStream out = new ObjectOutputStream(fos);
    
    if (quitornot.compareToIgnoreCase("q") == 0) {
    for (int cnt4 = 0; (requests[cnt4] != null); cnt4++) {
    requests[cnt4].Display();
    System.out.println();
    out.writeObject(requests[cnt4]);
    out.close();
    }// end for loop
    cnt++;
    } //end if statement
    
    Thanks for any help offered

Author

Message

ramesh

Posted: 2007-8-6 17:59:00

Top

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Index ‹ java-programmer

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- 1
  - redirect problemHi everyone,
    
    I have a problem, I am connectin to a lotus notes database to download
    a file (using URLConnection)
    
    ...gbp.nsf/agWebLAL?OpenAgent&UNID=A9D19EDE65447DF5C1256F2000465E87
    
    The thing is lotus notes doesn't give the filename, it redirects me to
    something first, then downloads the filename..
    
    Does anyone know of a way on how I can get the final url (the place
    where I am being redirected), filename and mimetype
    
    Thanks!
- 2
  - tridimensional view in B&WI made a program with java3d and I can print views from it.
    I want to print only the lines like the wireframe but without hide lines
    
    Have you same Ideas??
    
    zeno
- 3
  - Printing using CUPS in Linux and Java 1.5According to the blurb one of the upgrades in 1.5 is the ability to
    print using CUPS in Linux. Does anyone have this working? I cannot get
    my Jva application to communicate with CUPS.
    
    Thanks,
    
    Alan
- 4
  - JSTL & Source Code
    
    JavaScript and CSS programmers have for years, been looking for the
    "holy grail", i.e., the ability to hide source code.
    
    Take at look at www.dice.com, do a job search then view source.....
    nothing there except JSTL noatation per below:
    
    -------------------------- start -------------------------------------
    
    
    
    
    
    
    
    ------------------------ end -----------------------------------------
    
    Was not aware that a fringe benefit of JSTL was the ability to hide
    html source code. How secure is this? Can someone hack it to get the
    html source?
    
    I'm one of those Java/JavaScript/CSS programmers that has created
    graphics with CSS on Web pages and would like to keep the code
    private. I have found a crude way but I like the above better.
    
    Thanks
- 5
  - difference between endorsed and lib folders?hi..
    
    can somone please explain to me what is the difference between the
    endorsed and lib folders in common folder in tomcat? i tried reading
    the documentation but i couldn't figure it out.
- 6
  - [ANNOUNCE] DataDirect Technologies Releases DataDirect XQuery to Simplify XML and Relational Data Integration[ANNOUNCE] BEDFORD, Mass.--Sept. 20, 2005--DataDirect Technologies
    (http://www.datadirect.com), the software industry leader in
    standards-based components for connecting applications to data and an
    operating unit of Progress Software Corporation, today announced the
    release of DataDirect XQuery(TM), the first embeddable component for
    XQuery that is modeled after the XQuery API for Java(TM) (XQJ).
    Developers can download a free trial of DataDirect XQuery today at:
    http://www.datadirect.com/downloads/registration/xquery/index.ssp
    
    "Internet developers typically spend much of their time creating and
    restructuring XML, using data from many sources, generally including
    relational data. This task is much too tedious in most environments.
    Using DataDirect XQuery, which is based on the W3C's XML Query
    (XQuery), simplifies the programming task significantly, solving the
    same problems with much less code," said Jonathan Robie, Program
    Manager for DataDirect XQuery and an editor of the W3C XQuery
    specification. "Using DataDirect XQuery means that your applications
    can run on any Java platform, accessing data from the major relational
    databases, using any Web server or application server, or using no
    server at all. And DataDirect XQuery performs quite well, even when
    your query creates large XML results."
    
    DataDirect XQuery supports all major relational databases, including
    Oracle, Microsoft SQL Server 2000, IBM DB2, and Sybase, on any Java
    platform, allowing developers to query XML, relational databases, or a
    combination of the two. Query results can be used for XML-based data
    exchange, XML-driven Web sites, and other applications that require or
    leverage the power of XML. DataDirect XQuery provides IT professionals
    with a highly productive, powerful, simple, and standards-based
    approach to XML and relational data integration.
    
    Simplifying XML and Relational Data Integration
    
    DataDirect XQuery simplifies XML and relational data integration by
    providing developers with an XQuery implementation that offers greater
    productivity, performance and interoperability for building
    standards-based data integration applications, and here's how:
    
    ?Productivity: Web services, Web sites, data integration, and
    publishing are just a few examples of the many types of applications
    that need data from many sources, including relational and XML. For the
    first time, DataDirect XQuery enables developers to easily process both
    XML and relational data using industry-standard XQuery. DataDirect
    XQuery simplifies application development by reducing the amount of
    code developers write and maintain to use XML and relational data
    together. The result: reduced application complexity, shorter
    development cycles and more powerful applications - all based on the
    current W3C XQuery standard yet to be finalized.
    ?Performance: DataDirect XQuery optimizes and mediates query
    performance when accessing relational data. DataDirect XQuery is
    designed to move the minimum amount of data out of the database - for
    example, XQuery code is converted to SQL statements which are executed
    on the database server - thus providing the best performance possible.
    ?Interoperability: It's easy to embed DataDirect XQuery in
    applications: it does not require any other product or application
    server, it has no server of its own, it is not tied to a specific
    vendor database or database version, and it is based on the current
    version W3C XQuery and XQuery API for Java (XQJ) standards yet to be
    finalized. Application developers can write one easy-to-maintain
    application, regardless of the databases and versions they are using -
    Oracle, DB2, Microsoft SQL Server, or Sybase. This approach results in
    more extensible and interoperable applications which are insulated from
    the frequent database updates and changes in the database vendor tools.
    
    "In the past, our web-based XML Human Resources applications generated
    and sent XML data using data stored in an Oracle database," said Mark
    Zimmerman, VP of IT, at Gevity, a leading provider of employee
    management solutions. "We found DataDirect XQuery to be fast, scalable,
    and reliable. And because DataDirect XQuery allows us to leave the data
    access code in the middle tier, and not tied to a specific database,
    our application is insulated from any changes in the back end,
    improving application interoperability. Overall, we're very pleased
    with DataDirect XQuery."
    
    "Most XQuery implementations either work only with XML files in memory,
    or are bound to a particular database or application server - these are
    serious restrictions if your organization or partners have different
    databases, require scalability, or need to integrate with legacy data,"
    said Jerry King, Vice President of the XML Products Group at DataDirect
    Technologies. "DataDirect XQuery is the first and only product that
    truly makes your XQuery just as portable as your XML - you can use it
    on any Java platform, with any major relational database, and it
    integrates seamlessly with your Java applications using an industry
    standard query language and processing API. DataDirect XQuery is a
    quantum leap forward in data integration technology, providing
    developers with more power, performance and interoperability than ever
    before, and developers can download and try it out today."
    
    Availability
    
    DataDirect XQuery is available today. For more information, please
    contact Nancy Vodicka at 919-461-4326, or visit our Web site at
    www.datadirect.com/xquery. Developers can also download the DataDirect
    XQuery for a free 15-day trial at:
    http://www.datadirect.com/downloads/registration/xquery/index.ssp
    
    About DataDirect Technologies
    
    DataDirect Technologies is focused on standards-based data
    connectivity, enabling software developers to quickly develop and
    deploy business applications across all major databases and platforms.
    DataDirect Technologies offers the most comprehensive, proven line of
    data connectivity components available anywhere. Developers worldwide
    at more than 250 leading independent software vendors and thousands of
    corporate IT departments rely on DataDirect?products to connect their
    applications to an unparalleled range of data sources using
    standards-based interfaces such as ODBC, JDBC and ADO.NET. Developers
    also depend on DataDirect to radically simplify complex data
    integration projects using XML products based on the emerging XQuery
    and XQJ standards. DataDirect Technologies is an operating unit of
    Progress Software Corporation, a US$300+ million global software
    industry leader. Headquartered in Bedford, Mass., DataDirect
    Technologies can be reached on the Web at www.datadirect.com or by
    phone at +1-800-876-3101.
    
    DataDirect and DataDirect XQuery are trademarks or registered
    trademarks of DataDirect Technologies Corp. in the U.S. and other
    countries. Java and all Java based marks are trademarks or registered
    trademarks of Sun Microsystems, Inc. in the U.S. and in other
    countries. Any other trademarks contained herein are the property of
    their respective owner
    
    Contact:
    DataDirect Technologies
    Nancy Vodicka, 919-461-4326
    email***@***.com
- 7
  - Referencing enclosing class from inner classHi everyone,
    I'm trying to understand inner classes, but came across the following
    problem. If I define two types (one is an inner class), and each type
    has a method with the same name, is there a way that I can call the
    enclosing instance's method from within an instance of the inner class?
    I'm guessing that (as per the example pasted below) the getValue()
    methods aren't overloaded or overridden because the two classes don't
    participate in super-class/sub-class OO relationship. I'd be grateful
    for any insight.
    Thanks,
    Jonathan
    
    public class EnclosingClass {
    
    private int _value = 100;
    
    private class InnerClass
    {
    public int getValue()
    {
    return _value * 2;
    }
    
    public void println()
    {
    System.out.println(getValue()); //<-- inner
    System.out.println(getText()); //<-- enclosing
    }
    }
    
    public int getValue()
    {
    return _value;
    }
    
    public String getText()
    {
    return "hello!";
    }
    
    public static void main(String[] args)
    {
    // create an instance of both classes and call the println method of
    the inner class
    new EnclosingClass().new InnerClass().println();
    }
    
    }
- 8
  - coordinating eventsHi there,
    
    I'm having difficulty trying to coordinate the sequence of events for
    populating a JTree with data received from a server app. I'm so-o-o-o close
    and yet no banana! It's proving to be very tricky processing. I could use
    some help in trying to make this work properly. Perhaps you may understand
    better as to why my efforts are being thwarted by the either the JTree
    object or its DefaultTreeModel?
    
    Here's the setup:
    
    1) I have a server app that, when requested from the client app, will
    provide a child count on any given directory node on the server. Also, it
    will serve up the names of each child node for any given node upon request.
    
    2) The client app contains a JTree object that I'm trying to initially
    populate with the root node. Subsequently, the plan is to dynamically
    populate any directory node in the JTree whenever the treeWillExpand( ... )
    event is triggered as the user tries to expand on a node.
    
    3) Throughout my code I have a number of System.out.println( ... )
    statements so that I can see what sequence of events are taking place as the
    client app makes requests to the server and receives replies back from the
    server. Also, some println(...) statements in some key methods which you'll
    see.
    
    4) The sequence of events is supposed to go like so:
    
    i) root node is created
    ii) as the root node is passed as a parameter when creating the JTree
    object
    the getChildCount( ) method of the root node [type DefaultTreeNode
    extends DefaultMutableTreeNode ]
    is called.
    
    public int getChildCount()
    {
    if (!hasChildren)
    {
    defineChildNodes();
    }
    return(super.getChildCount());
    }
    
    iii) Since the root node initially has no children, getChildCount( )
    then calls the method
    defineChildNodes( ).
    
    protected void defineChildNodes()
    {
    hasChildren = true;
    ref.requestChildCountFromServer(this);
    }
    
    As you can see, defineChildNodes( ) simply sets the flag
    hasChildren to true then
    calls a method requestChildCountFromServer(this) which exists in a
    class called Response
    referred here by the variable "ref". Also in the Response class
    there exists the method
    populateTree( ) which initially created the root node and JTree
    objects:
    
    protected void populateTree(String NodeName)
    {
    //System.out.println("Entering populatTree() method");
    //This could take a while, so change the cursor icon
    //ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    try
    {
    String separator = "";
    if(ref.serverOS.equals("Windows"))
    separator = "\\";
    else
    separator = "/";
    rootNode = new DefaultTreeNode(NodeName, true, separator);
    expandingNode = rootNode;
    String rootPath = getLeadingPath(ref.rootPath);
    rootNode.setLeadingPath(rootPath);
    rootNode.setResponseReference(this);
    jTree1 = new JTree(rootNode);
    jTree1.setRootVisible(true);
    jTree1.setShowsRootHandles(true);
    jTree1.collapseRow(0);
    MouseListener popupListener = new PopupListener(ref);
    jTree1.addMouseListener(popupListener);
    
    //Listen to our own expand/collapse events to keep the labels in
    sync
    jTree1.addTreeWillExpandListener(this);
    
    }
    catch(Exception e){System.out.println("Exception in populateTree()
    method"); e.printStackTrace();return;}
    ....
    ....
    }
    
    iv) The requestChildCountFromServer( ) method then makes a request to
    the server app for
    the child count for the root node.
    
    v) I have a separate thread running that listens for all responses
    from the server
    called ResponseListener. In its run( ) method I have the
    following code:
    
    else if(connected == ref.ref.SENDING_CHILDCOUNT)
    {
    System.out.println("Received message: ReceivingChildCount");
    ref.expandingNode.numChildren = input.readInt();
    //expandingNode.setReceivedChildCount(true);
    ref.ref.imageLabel.setIcon(ref.ref.blank);
    ref.ref.textLabel.setText("");
    }
    
    When the root node was originally created I set a reference to it
    using a variable
    named expandingNode. Here you can see that the root node's
    instance variable
    named numChildren is set to a value read in by the DataInputStream
    object
    named input.
    
    vi) The requestChildCountFromServer( ) method in turn calls another
    method in the
    Response class named RequestChildrenFromServer(String path).
    RequestChildrenFromServer(String path) method requests from the
    server the names
    of all the child nodes for the root node.
    
    vii) ResponseListener then receives a response from the server:
    
    else if(connected == ref.ref.SENDING_TREE_DATA)
    {
    System.out.println("Received message: SendingTreeData");
    ref.expandingNode.TreeDataIncoming = true;
    ref.expandingNode.ReceiveChildrenFromServer(input);
    ref.ref.imageLabel.setIcon(ref.ref.blank);
    ref.ref.textLabel.setText("");
    }
    
    Here you can see that the root nodes method named
    ReceiveChildrenFromServer(input) is then called
    while passing it a reference to the DataInputStream so that the
    method can
    read in the names of the child nodes as they come in over the
    wire.
    
    viii) The root node's method ReceiveChildrenFromServer(input) then
    begins receiving the
    names of each child node, creates a new DefaultTreeNode object
    for each child node
    and adds it to the root node, seen below:
    
    protected void ReceiveChildrenFromServer(DataInputStream input)
    {
    System.out.println("Entering ReceiveChildrenFromServer()");
    
    DefaultTreeNode child = null;
    String name = "";
    try
    {
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    //System.out.println("numChildren = " + numChildren);
    int nodeType = 0;//default
    //iterate through each of the children as they come in
    //from the server.
    for(int i = 0; i < numChildren; i++)
    {
    name = input.readUTF(); //get the name
    System.out.println("child node: " + name);
    child = new DefaultTreeNode(name); //create a new
    child node
    
    //determine if this node is a directory
    //or a file. Empty directories are denoted
    //as having (nodeType == -1)
    nodeType = input.readInt();
    //System.out.println("node type: " + nodeType);
    if(nodeType == 0)
    {
    //Since a file is a leaf node
    //we won't be needing to continue
    //reading in nodes for it.
    child.setResponseReference(ref);
    child.setAllowsChildren(false);
    child.setHasChildren(false);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    }
    else if(nodeType == -1)
    {
    child.setResponseReference(ref);
    child.setAllowsChildren(true); //It's an empty
    directory
    child.setHasChildren(false);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    
    }
    else
    {
    child.setResponseReference(ref);
    child.setAllowsChildren(true); //It's a directory
    with child nodes
    child.setHasChildren(true);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    }
    
    this.insert(child,i);
    }//end for loop
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }//end try
    catch(IOException ioe){ioe.printStackTrace();}
    catch(NullPointerException npe){npe.printStackTrace();}
    }//end method
    
    IT IS HERE THAT I RUN INTO PROBLEMS!!!!
    
    All the code you see compiles fine. What I found annoying is that, at
    run-time, the sequence of events were as I depict them here until I start
    reading in the names of the childnodes with the
    ReceiveChildrenFromServer(...) method. While it is going through its for
    loop, mysteriously the method getChildCount( ) is called again, which in
    turn calls defineChildNodes( ), which in turn calls
    requestChildCountFromServer(...), which interrupts the processing of the for
    loop in ReceiveChildrenFromServer(...) . Here is the read out from the
    console to prove it:
    
    ***************************************
    Entering requestChildCountFromServer
    waiting for response...
    checking...
    Received message: ReceivingChildCount
    checking...
    got ChildCount: 26 <<<Root node has 26 child nodes
    Entering RequestChildrenFromServer()
    path is: C:\JavaProjects
    Finished calling server for children
    Received message: SendingTreeData
    Entering ReceiveChildrenFromServer()
    checking for tree data ...
    child node: AssignmentServer <<<<ReceiveChildrenFromServer(...)
    method begins reading in names
    child node: AssignmentSubmitter
    child node: Borland
    child node: ClientServerJTreeProject
    child node: DBJavaBean
    child node: DirAdmin.bak
    Entering requestChildCountFromServer <<<This method is called by
    defineChildNodes( ) which was
    
    called by getChildCount( )
    waiting for response...
    checking...
    checking...
    Node Expanding.
    checking...
    checking...
    got ChildCount: 0 <<< Don't know
    why this is reading zero. It should be 26
    child node: DirectoryAdministratorProject <<<For loop from
    ReceiveChildrenFromServer(...) method
    
    resumes reading in names
    child node: EZSmtp
    child node: Icon Editor
    child node: images
    child node: IniFileProject
    child node: J2exe
    child node: JCalculator
    child node: JGridProject
    child node: JSlideShow
    child node: MSSTextEditorProject
    child node: MySQL_JDBC
    child node: PersonalNetSearchProject
    child node: Print_Preview
    child node: PropertiesFileAccessExample
    child node: Sample_EBusiness
    child node: SharewareProject
    child node: SystemTreeProject
    child node: TestProgram
    child node: Thread_Pooling
    child node: ZeroG
    Received message: ReceivingChildCount
    *****************************************
    
    Ultimately, I wind up with a root node being displayed in the JTree that
    only has maybe five or six child nodes displayed when there should be 26
    child nodes.
    
    For further clarity here are the methods requestChildCountFromServer(...)
    and RequestChildrenFromServer(...):
    
    public void requestChildCountFromServer(DefaultTreeNode node)
    {
    
    System.out.println("Entering requestChildCountFromServer");
    String name = "";
    try
    {
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    
    output.writeInt(ref.PATH);
    output.flush();
    output.writeUTF(node.getWholeServerPath());
    output.flush();
    output.writeInt(ref.REQUEST_CHILD_COUNT);
    output.flush();
    System.out.println("waiting for response...");
    timer1 = new ChildCountTimer(node);
    timer1.start();
    timer1.join();
    System.out.println("got ChildCount: " + node.numChildren);
    if(node.numChildren > 0)
    {
    //NodeExpanding = false; //reset
    RequestChildrenFromServer(node.getWholeServerPath());
    //Set up TreeDataTimer so that we know we have a
    //response from the server.
    timer2 = new TreeDataTimer(node);
    timer2.start();
    timer2.join();
    }
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }
    catch(InterruptedException ie){}
    catch(IOException ioe){ioe.printStackTrace();}
    catch(NullPointerException npe){npe.printStackTrace();}
    }
    
    protected void RequestChildrenFromServer(String path)
    {
    System.out.println("Entering RequestChildrenFromServer()");
    
    //Request Children from server
    try
    {
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    output.writeInt(ref.PATH);
    output.flush();
    System.out.println("path is: " + path);
    output.writeUTF(path);
    output.flush();
    //Sending REQUEST_CHILDREN should cause a response
    //from the server: SENDING_TREE_DATA
    output.writeInt(ref.REQUEST_CHILDREN);
    output.flush();
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    
    }
    catch(IOException ioe){ioe.printStackTrace();}
    System.out.println("Finished calling server for children");
    }
    
    I realize this post is rather lengthy, however, I didn't know how else to
    explain my dilemma with this project. If you need more information, just
    ask.
    
    Please advise,
    
    Alan
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